Considering K-5

I'm looking for an affordable DSLR and stumbled across a couple of reviews quite positive on the K-5. I found out that I can have it with the kit 18-55mm lens for just above one grand (in Australia) and that fits my budget.

However I found little info on the above kit lens. Is it weather sealed? How good is it? Would you rather recommend to get just the body and then the lens(es) separately?

Also, are there any faults/quirks with the K-5 that one should know about before making the purchase decision?